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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864e2477455548e31a6b269c2ec77d370ea5c49961636b52be873b6b7f903d25' 
  AND token = 'aD3whQ4MEXUcU1d40d053dmOdsUnIjH4yixC64Rvjn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}